JPH09325122A - Method for inspecting foreign matter in transparent container - Google Patents
Method for inspecting foreign matter in transparent containerInfo
- Publication number
- JPH09325122A JPH09325122A JP8163759A JP16375996A JPH09325122A JP H09325122 A JPH09325122 A JP H09325122A JP 8163759 A JP8163759 A JP 8163759A JP 16375996 A JP16375996 A JP 16375996A JP H09325122 A JPH09325122 A JP H09325122A
- Authority
- JP
- Japan
- Prior art keywords
- container
- liquid
- light
- foreign matter
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
- G01N21/9018—Dirt detection in containers
- G01N21/9027—Dirt detection in containers in containers after filling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
- G01N21/9036—Investigating the presence of flaws or contamination in a container or its contents using arrays of emitters or receivers
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、筒状の透明な容器、主と
して円柱状の容器内に封入されている透明な液体中の異
物の混入を画像処理技術によって検査する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical transparent container, and more particularly to a method for inspecting foreign substances in a transparent liquid sealed in a cylindrical container by an image processing technique.
【０００２】[0002]
【従来の技術】薬液などの製造過程で、容器内の液体に
異物が混入する事故が起きている。製造物責任法の観点
から、そのような事故は、完全になくしなければならな
い。従来の異物検査は、作業員の目視による観察によっ
て行われているが、容器表面での外部からの散乱光の反
射や輝線の発生によって、その検査精度や検査能率は、
悪いものとなっており、大量生産過程での１つの障害と
なっている。2. Description of the Related Art In the process of manufacturing a chemical liquid or the like, an accident occurs in which a foreign substance is mixed in the liquid in the container. From the perspective of the Product Liability Act, such an accident must be completely eliminated. Conventional foreign matter inspection is performed by visual observation by an operator, but due to the reflection of scattered light from the outside and the generation of bright lines on the container surface, the inspection accuracy and inspection efficiency are
It is bad and is one obstacle in the mass production process.
【０００３】[0003]
【従来技術の課題】このような実情から、製造現場にお
いて、高精度で検査速度の速い検査手段が望まれてい
る。そこで、画像処理技術を利用して、透明容器内の液
体を観察することが試みられているが、上記のように、
外部の散乱光や、容器表面の付着物の存在、液体中の気
泡の識別、小さな異物の光学的拡大上の問題などから、
画像処理による適切な検査方法がまだ確立されていな
い。したがって、従来技術の課題は、どのような照明を
使用して、照明と撮像用のカメラとの位置関係を設定
し、気泡と異物との識別を行うかである。2. Description of the Related Art Due to such circumstances, there is a demand for a highly accurate inspection means having a high inspection speed at a manufacturing site. Therefore, it has been attempted to observe the liquid in the transparent container using image processing technology.
Due to scattered light from the outside, the presence of deposits on the container surface, the identification of air bubbles in the liquid, the problem of optical expansion of small foreign matter, etc.
An appropriate inspection method by image processing has not been established yet. Therefore, the problem of the conventional technique is to use what kind of illumination is used to set the positional relationship between the illumination and the camera for image pickup, and to distinguish bubbles from foreign matter.
【０００４】[0004]
【発明の目的】したがって、本発明の目的は、透明な筒
状の容器内の液体に対する異物の混入を適切な照明、そ
の照明に対する適切な撮像位置の関係、さらに、異物と
気泡とを識別しながら検査できるようにすることであ
る。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to properly detect the mixing of foreign matter into a liquid in a transparent cylindrical container, the relationship between the appropriate imaging position for the lighting, and the foreign matter and bubbles. While being able to inspect.
【０００５】[0005]
【発明の解決手段】画像処理による異物検査では、次の
条件が満足されなければならない。 （１）透明な容器の表面の付着物や印刷を避けた状態で
容器の内部が観察できること。 （２）照明の届いている範囲で液体が確実に検査できる
こと。 （３）カメラ側から観察可能な範囲がもれなく検査でき
ること。 （４）カメラの焦点深度が適切で、異物として検出可能
な範囲が充分であること。 （５）透明な容器内の真の異物と気泡との識別が可能と
なること。 （６）透明な容器の内部の照明光の二次反射の影響のな
い状態で撮像が可能となること。In the foreign matter inspection by image processing, the following conditions must be satisfied. (1) The inside of the container can be observed while avoiding deposits and printing on the surface of the transparent container. (2) The liquid can be reliably inspected within the range of lighting. (3) Being able to inspect without fail the range that can be observed from the camera side. (4) The depth of focus of the camera is appropriate and the range that can be detected as a foreign substance is sufficient. (5) It is possible to distinguish between true foreign matter and bubbles in a transparent container. (6) Capable of imaging without being affected by the secondary reflection of illumination light inside the transparent container.
【０００６】そこで、本発明は、前記の条件をすべて満
足するために、容器の側方位置の光源から所定の拡散角
度の照明光を容器および容器内の液体に向けて照射する
とともに、上記照明光の光束の中心に対して直角方向よ
りある角度ふらせた位置で異物からの反射光量の多い位
置に、カメラを配置し、このカメラにより照明光の入射
・反射のない容器側面から容器内の液体を撮像し、その
画像から画像処理により異物候補を検出したとき、上記
光源と対向する容器の側方位置の光源からの所定の拡散
角度の照明光のみを容器内の液体に向けて照射し、液体
中の気泡からの反射光の受光量を増加させて、上記カメ
ラにより容器内の液体の同一視野を撮像し、その画像か
ら画像処理により液体中の気泡を検出し、画像上の気泡
の存在位置と対応しない位置の画像上の異物候補を異物
と判定するようにしている。Therefore, according to the present invention, in order to satisfy all the above-mentioned conditions, the light source at a lateral position of the container irradiates the container and the liquid in the container with illumination light having a predetermined diffusion angle, and the above-mentioned illumination is performed. A camera is placed at a position where a large amount of light is reflected from a foreign object at a position offset by a certain angle from the direction perpendicular to the center of the light flux, and the camera allows the liquid inside the container to enter from the side of the container where illumination light does not enter or reflect. Is imaged, when a foreign substance candidate is detected by image processing from the image, only the illumination light of a predetermined diffusion angle from the light source at the side position of the container facing the light source is irradiated toward the liquid in the container, The amount of reflected light from the bubbles in the liquid is increased, the same field of view of the liquid in the container is captured by the above camera, the bubbles in the liquid are detected by image processing from the image, and the presence of bubbles on the image Correspondence with position An image on the foreign object candidate without position so that it is determined that the foreign matter.
【０００７】[0007]
【発明の実施の形態】図１は、検査対象の透明な容器１
を示している。この容器１は、例えば透明なガラス製の
円筒体であり、内部に薬液などの透明な液体２を収容し
た状態で、中間部分のゴム栓３および底部のゴム栓４に
よって、液体２を封入した状態となっている。なお、容
器１の先端部分は、先細りとなっており、その開口部分
は、キャップ５によって塞がれている。検査事項は、上
記液体２の内部の異物６の混入であり、この異物６の混
入状態は、液体２の中の気泡７の存在時に、それとと識
別しながら検出される。FIG. 1 shows a transparent container 1 to be inspected.
Is shown. The container 1 is, for example, a transparent glass cylindrical body, and in a state in which a transparent liquid 2 such as a chemical solution is contained, the liquid 2 is sealed by a rubber stopper 3 at an intermediate portion and a rubber stopper 4 at a bottom portion. It is in a state. The tip of the container 1 is tapered, and the opening is closed by a cap 5. The inspection item is the mixing of the foreign matter 6 inside the liquid 2, and the mixed state of the foreign matter 6 is detected when the bubble 7 in the liquid 2 is present, while distinguishing from the presence of the bubble 7.
【０００８】次に、図２は、容器１に対する照明と撮像
位置との位置関係の具体例を示している。この具体例
は、一例として、多くの撮像範囲を短時間に処理するた
めに、２つの照明用の光源８１、８２および４台の撮像
用のカメラ９１、９２、９３、９４を使用している。Next, FIG. 2 shows a specific example of the positional relationship between the illumination of the container 1 and the image pickup position. This specific example uses two illumination light sources 81 and 82 and four imaging cameras 91, 92, 93, and 94 in order to process a large number of imaging ranges in a short time. .
【０００９】照明用の光源８１、８２は、強力な照明光
を得るために、例えばキセノンランプを使用しており、
その光束は、光ファイバー１０の内部を通り、適当な拡
散角度の照明光として、容器１の側面に向けて照射され
る。ここで、光源８１、８２は、容器１の両側方位置、
すなわち容器１の中心を通る中心線１４上で、容器１を
挟む各位置にそれぞれ設けられている。それぞれの照明
光は、シャッター１１の開放時に、容器１の対向外周面
に向けて投射され、空気とガラスとの屈折、ガラスと液
体との屈折率にもとづいて、容器１の内部に進入する。The light sources 81 and 82 for illumination use, for example, a xenon lamp in order to obtain strong illumination light.
The light flux passes through the inside of the optical fiber 10 and is emitted toward the side surface of the container 1 as illumination light having an appropriate diffusion angle. Here, the light sources 81 and 82 are located on both sides of the container 1,
That is, it is provided at each position sandwiching the container 1 on the center line 14 passing through the center of the container 1. When the shutter 11 is opened, the respective illumination lights are projected toward the opposing outer peripheral surface of the container 1, and enter the inside of the container 1 based on the refraction index of air and glass and the refraction index of glass and liquid.
【００１０】図３は、光源８１からの照明光の光路、お
よび異物６や気泡７からのカメラ９１、９２、カメラ９
３、９４に対する光量分布を示している。照明光の光束
のうち、中心の部分は、光束の中心線１４にほぼ平行な
状態で容器１の内部に入る。また、中心から離れた位置
のほとんどの照明光は、容器１の内周面に内接するよう
な経路を経て外部に進み、さらに他の少しの照明光は、
容器１の表面で反射して外部に進む。この結果、照明光
の中心に対して直角の方向で、容器１の外周部分に照明
光の入射・反射のない側面が形成される。FIG. 3 shows the optical path of the illumination light from the light source 81 and the cameras 91, 92 and the camera 9 from the foreign matter 6 and bubbles 7.
The light intensity distributions for 3 and 94 are shown. A central portion of the luminous flux of the illumination light enters the inside of the container 1 in a state substantially parallel to the center line 14 of the luminous flux. Further, most of the illumination light at a position away from the center travels to the outside through a path that is inscribed in the inner peripheral surface of the container 1, and a little other illumination light is
It reflects on the surface of the container 1 and travels to the outside. As a result, a side surface that does not enter or reflect the illumination light is formed on the outer peripheral portion of the container 1 in a direction perpendicular to the center of the illumination light.
【００１１】カメラ９１、９２、９３、９４は、照明光
の入射・反射のない容器１の側面を撮像窓として、その
撮像窓に対向する撮像位置で、光源８１、８２からの照
明光の使い分けにより、異物６からの反射光量の多い位
置、および気泡７からの反射光量の多い位置で、容器１
の内部の視野に向けてそれぞれ配置されてい
る。The cameras 91, 92, 93, 94 use the illumination light from the light sources 81, 82 at the image pickup position facing the image pickup window, with the side surface of the container 1 which does not enter or reflect the illumination light as the image pickup window. Therefore, at the position where the amount of reflected light from the foreign matter 6 is large and the position where the amount of reflected light from the bubble 7 is large,
Are arranged toward the internal visual field.
【００１２】ここで、異物６および気泡７からの反射光
量の多い位置は、それぞれ実験的に求める。薬品などの
製造過程で、混入が予測される異物６やその液体２とし
ての薬液中の気泡７は、それぞれ特有の光学的特性を有
する。したがって、混入が予測される異物６について、
反射光量の多い位置は、その外形や、光の反射表面の光
学的特性、光の吸収率などにより特徴づけられる。Here, the positions where the amount of reflected light from the foreign matter 6 and the bubbles 7 is large are experimentally obtained. The foreign matter 6 that is expected to be mixed in during the manufacturing process of chemicals and the bubbles 7 in the chemical liquid as the liquid 2 have unique optical characteristics. Therefore, regarding the foreign matter 6 that is expected to be mixed,
The position with a large amount of reflected light is characterized by its outer shape, optical characteristics of the light reflecting surface, light absorptance, and the like.
【００１３】図３は、異物６として、最も一般的な形状
すなわち不透明な立方体で、不規則でなめらかな表面を
有する試料からの反射光量の分布を示している。実験結
果によれば、異物６が照明光に対して如何なる姿勢の状
態にあったとしても、その光量分布は、照明光の中心線
１４に対して直交する直線１５から照明光寄りに多くな
っている。また、水に近い屈折率の液体２の中の気泡７
によると、その大きさにかかわらず、それからの反射光
量は、上記直線１５を中心として、照明光から離れる方
向に従って急激に多くなる。これは、気泡表面で、普通
の反射から全反射に切り換わることによるものと推測さ
れる。FIG. 3 shows the distribution of the amount of reflected light from a sample having the most general shape, that is, an opaque cube as the foreign matter 6 and having an irregular and smooth surface. According to the experimental results, even if the foreign matter 6 is in any posture with respect to the illumination light, the light amount distribution increases from the straight line 15 orthogonal to the center line 14 of the illumination light toward the illumination light. There is. Also, bubbles 7 in the liquid 2 having a refractive index close to that of water
According to the above, regardless of the size, the amount of reflected light from the straight line 15 increases sharply in the direction away from the illumination light with the straight line 15 as the center. It is presumed that this is due to switching from normal reflection to total reflection on the bubble surface.
【００１４】上記の実験結果にもとづいて、カメラ９
１、９２、９３、９４は、照明光の入射・反射のない方
向の位置で異物６からの反射光量の多い位置および気泡
７からの反射光量の多い位置として、直線１５よりある
角度αだけふらせた位置で、それぞれ容器１のほぼ中心
位置に向けられ、液体２の視野を合焦範囲とし
ている。Based on the above experimental results, the camera 9
Reference numerals 1, 92, 93, and 94 are positions in a direction in which illumination light is not incident / reflected, where the amount of reflected light from the foreign matter 6 is large and the amount of reflected light from the bubble 7 is large, and the angle is shifted by a certain angle α from the straight line 15. At different positions, they are directed substantially to the central position of the container 1, respectively, and the field of view of the liquid 2 is in the focusing range.
【００１５】ここで、カメラ９１は、照明８１からの照
明光の照射時に、視野について異物６を検出するため
に、容器１の内部の液体２を撮像し、光源８２からの照
明光の照射時に、視野について気泡７を検出するため
に、容器１の内部の液体２を撮像する。また、カメラ９
２は、照明８１からの照明光の照射時に、視野につい
て異物６を検出するために、容器１の内部の液体２を撮
像し、光源８２からの照明光の照射時に、視野につい
て気泡７を検出するために、容器１の内部の液体２を撮
像する。Here, the camera 91 takes an image of the liquid 2 inside the container 1 in order to detect the foreign matter 6 in the visual field when the illumination light is emitted from the illumination 81, and when the illumination light is emitted from the light source 82. , The liquid 2 inside the container 1 is imaged in order to detect the bubbles 7 in the field of view. Also, the camera 9
2 images the liquid 2 inside the container 1 in order to detect the foreign matter 6 in the visual field when the illumination light is emitted from the illumination 81, and detects the bubbles 7 in the visual field when the illumination light is emitted from the light source 82. To do this, the liquid 2 inside the container 1 is imaged.
【００１６】さらに、カメラ９３は、照明８２からの照
明光の照射時に、視野について異物６を検出するため
に、容器１の内部の液体２を撮像し、光源８１からの照
明光の照射時に、視野について気泡７を検出するため
に、容器１の内部の液体２を撮像する。また、カメラ９
４は、照明８２からの照明光の照射時に、視野につい
て異物６を検出するために、容器１の内部の液体２を撮
像し、光源８１からの照明光の照射時に、視野につい
て気泡７を検出するために、容器１の内部の液体２を撮
像する。Further, the camera 93 images the liquid 2 inside the container 1 in order to detect the foreign matter 6 in the visual field when the illumination light is emitted from the illumination 82, and when the illumination light is emitted from the light source 81, The liquid 2 inside the container 1 is imaged in order to detect the bubbles 7 in the field of view. Also, the camera 9
Reference numeral 4 images the liquid 2 inside the container 1 in order to detect the foreign matter 6 in the visual field when the illumination light is emitted from the illumination 82, and detects the bubbles 7 in the visual field when the illumination light is emitted from the light source 81. To do this, the liquid 2 inside the container 1 is imaged.
【００１７】なお、カメラ９１、９２、９３、９４は、
ともに直線１５に対して、同一の角度αで各光源８１、
８２の方向寄りに片寄りを持っているため、光源８１、
８２の切り換えにより異物６の検出、気泡７の検出の両
目的を果たすことになる。The cameras 91, 92, 93 and 94 are
Both of the light sources 81 at the same angle α with respect to the straight line 15,
Since the light source 81 has a bias toward the direction of 82,
The switching of 82 serves both purposes of detecting the foreign matter 6 and detecting the bubble 7.
【００１８】まず、光源８１のみが容器１の内部に照明
光を照射しているときに、カメラ９１、９２は、異物６
を検出するために、高倍率で容器１の内部の視野を
合焦状態として撮像し、また、カメラ９３、９４は、気
泡７を検出するために、高倍率で容器１の内部の視野
を合焦状態として撮像する。First, when only the light source 81 is illuminating the inside of the container 1 with the illumination light, the cameras 91 and 92 detect the foreign matter 6
In order to detect the air bubbles, the visual field inside the container 1 is imaged in a focused state at a high magnification, and the cameras 93 and 94 focus the visual field inside the container 1 at a high magnification to detect the bubbles 7. The image is taken in a focused state.
【００１９】つぎに、照明光の切り換えることにより、
光源８２のみが容器１の内部に照明光を照射していると
きに、カメラ９３、９４は、異物６を検出するために、
高倍率で容器１の内部の視野を合焦状態として撮像
し、また、カメラ９１、９２は、気泡７を検出するため
に、高倍率で容器１の内部の視野を合焦状態として
撮像する。Next, by switching the illumination light,
When only the light source 82 is illuminating the inside of the container 1 with the illumination light, the cameras 93 and 94 detect the foreign matter 6 in order to detect the foreign matter 6.
The field of view inside the container 1 is imaged at a high magnification as an in-focus state, and the cameras 91 and 92 image the field of view inside the container 1 at a high magnification as an in-focus state in order to detect the bubbles 7.
【００２０】なお、撮像時に、これらのカメラ９１、９
２、９３、９４に対する外部からの散乱光が撮像の障害
となるとき、遮光状態の撮像窓を形成するために、必要
に応じ、容器１とカメラ９１、９２、９３、９４との間
に、適当な開口板状のしゃ光体１２が設けられる。Note that these cameras 91 and 9 are used at the time of image pickup.
When scattered light from the outside with respect to 2, 93, and 94 interferes with imaging, in order to form an imaging window in a light-shielded state, between the container 1 and the cameras 91, 92, 93, and 94, if necessary, A suitable aperture plate-shaped light shield 12 is provided.
【００２１】このようにして、４つのカメラ９１、９
２、９３、９４からの画像データは、画像処理装置１３
の内部の画像メモリに記憶され、その後、画像処理プロ
グラムにもとづいて処理される。画像処理装置１３は、
異物検出用の画像データを例えば微分処理によって、信
号レベルの変化から異物６の候補の信号を検出するとと
もに、照明光の切り換えにより気泡７からの強化された
反射光についての画像データを同様に微分処理によっ
て、気泡７の信号を検出した後、画像上の気泡７に対応
しない画像上の異物６の候補を真の異物６と判定する。In this way, the four cameras 91, 9
The image data from 2, 93, and 94 are sent to the image processing device 13
It is stored in the image memory inside and is processed according to the image processing program. The image processing device 13
The image data for detecting the foreign matter is detected, for example, by a differentiating process to detect a candidate signal of the foreign matter 6 from the change in the signal level, and the image data on the reflected light enhanced from the bubble 7 is similarly differentiated by switching the illumination light. After the signal of the bubble 7 is detected by the processing, the candidate of the foreign substance 6 on the image that does not correspond to the bubble 7 on the image is determined to be the true foreign substance 6.
【００２２】以上の撮像・画像処理によって、容器１の
内部の液体２に混入した異物６が検出できるが、容器１
の内部の検査範囲が不充分なときに、照明用の光源８
１、８２およびカメラ９１、９２、９３、９４の設置台
数を増やし、検査可能の範囲を拡大するか、または容器
１を適切な角度例えば９０度だけ回転させて、上記の装
置により前回の検査範囲と交差する方向の検査範囲につ
いて検査を実行するか、あるいは光源８１、８２および
カメラ９１、９２、９３、９４の設置台数を増やして、
上記実施例で検査した範囲と交差する方向の範囲につい
ても同時に検査を実行するようにしてもよい。By the above-mentioned image pickup and image processing, the foreign matter 6 mixed in the liquid 2 inside the container 1 can be detected.
Light source 8 for illumination when the inspection range inside the
1, 82 and the number of cameras 91, 92, 93, 94 installed to increase the range that can be inspected, or the container 1 is rotated by an appropriate angle, for example, 90 degrees, and the previous inspection range is obtained by the above device. The inspection is performed on the inspection range in the direction intersecting with, or the number of installed light sources 81, 82 and cameras 91, 92, 93, 94 is increased,
The inspection may be simultaneously performed on the range in the direction crossing the range inspected in the above embodiment.
【００２３】また、上記実施例は、２つの光源８１、８
２に対して、４台のカメラ９１、９２、９３、９４を配
置しているが、カメラ９１、９２、９３、９４の倍率に
もよるが、その合焦範囲、すなわち焦点深度が容器１の
直径の範囲で確保できるならば、２つの光源８１、８２
に対して１台のカメラ９１、または２つの光源８１、８
２に対して２台のカメラ９１、９３により検査を実行す
ることもできる。In the above embodiment, the two light sources 81 and 8 are used.
4 cameras 91, 92, 93, 94 are arranged for 2, but the focusing range, that is, the depth of focus of the container 1 depends on the magnification of the cameras 91, 92, 93, 94. Two light sources 81 and 82 if they can be secured within the diameter range
For one camera 91 or two light sources 81, 8
It is also possible to carry out the inspection for two with two cameras 91, 93.
【００２４】また、液体２に気泡７の混入があり得ない
ならば、気泡７の検出用のプログラムは、必要なく、そ
の処理を省略することもできる。さらに、上記実施例
は、互いに異なる方向から照明光を投射しているが、一
方向からの照明光のみで充分な検査が可能であれば、光
源は１つだけであってもよい。さらに、容器１は、円筒
状に限らず、楕円筒状あるいは四角柱状などであっても
よい。Further, if the liquid 2 cannot contain the bubbles 7, the program for detecting the bubbles 7 is not necessary and the process can be omitted. Further, in the above embodiment, the illumination light is projected from different directions, but if the illumination light from one direction alone is sufficient for the inspection, only one light source may be used. Further, the container 1 is not limited to the cylindrical shape, and may be an elliptic cylindrical shape or a quadrangular prism shape.
【００２５】[0025]
【発明の効果】本発明では、前述の条件を満足できる状
態で、透明容器内の液体の異物混入の検査が可能となる
ため、しかもその検査が小さな異物に対しても高速で実
行できるため、薬液などの製造速度に合わせて全製品に
ついての検査が高速で確実に行える。As described above, according to the present invention, it is possible to inspect the liquid contained in the transparent container for foreign matter while satisfying the above-mentioned conditions, and the inspection can be performed at high speed even for small foreign matter. All products can be inspected quickly and reliably according to the manufacturing speed of chemicals.
【図１】検査対象の容器の断面図である。FIG. 1 is a cross-sectional view of a container to be inspected.
【図２】透明な容器に対する照明用の光源、撮像用のカ
メラの配置の平面図である。FIG. 2 is a plan view showing the arrangement of a light source for illumination and a camera for imaging with respect to a transparent container.
【図３】容器内の異物および気泡からの反射光の光量分
布の説明図である。FIG. 3 is an explanatory diagram of a light amount distribution of reflected light from foreign matter and bubbles in a container.
１ 透明な容器 ２ 液体 ３ ゴム栓 ４ ゴム栓 ５ キャップ ６ 異物 ７ 気泡 ８１、８２ 光源 ９１、９２、９３、９４ カメラ １０ 光ファイバー １１ シャッター １２ しゃ光体 １３ 画像処理装置 １４ 中心線 １５ 直線 1 transparent container 2 liquid 3 rubber stopper 4 rubber stopper 5 cap 6 foreign matter 7 bubbles 81, 82 light sources 91, 92, 93, 94 camera 10 optical fiber 11 shutter 12 light shield 13 image processor 14 center line 15 straight line
Claims (2)
体中の異物の混入を検査する方法であって、 容器の側方位置の光源から所定の拡散角度の照明光を容
器内の液体に向けて照射するとともに、上記照明光の光
束の中心に対して直角方向よりある角度ふらせた位置で
異物からの反射光量の多い位置に、カメラを配置し、こ
のカメラにより照明光の入射・反射のない容器側面から
容器内の液体を撮像し、その画像から画像処理により異
物を検出することを特徴とする透明容器内の異物検査方
法。1. A method for inspecting the mixture of foreign matter in a liquid enclosed in a transparent cylindrical container, comprising illuminating light at a predetermined diffusion angle from a light source at a lateral position of the container. While irradiating the liquid, the camera is placed at a position where a large amount of light is reflected from the foreign matter at a position offset by a certain angle from the direction perpendicular to the center of the luminous flux of the illuminating light. A method for inspecting foreign matter in a transparent container, which comprises imaging a liquid in the container from a side surface of the container without reflection and detecting foreign matter from the image by image processing.
体中の異物の混入を検査する方法であって、 容器の側方位置の光源から所定の拡散角度の照明光を容
器内の液体に向けて照射するとともに、上記照明光の光
束の中心に対して直角方向よりある角度ふらせた位置で
異物からの反射光量の多い位置に、カメラを配置し、こ
のカメラにより照明光の入射・反射のない容器側面から
容器内の液体を撮像し、その画像から画像処理により異
物候補を検出したとき、上記光源と対向する容器の側方
位置の光源から所定の拡散角度の照明光のみを容器内の
液体に向けて照射し、液体中の気泡からの反射光の受光
量を増加させて、上記カメラにより容器内の液体の同一
視野を撮像し、その画像から画像処理により液体中の気
泡を検出し、画像上の気泡の存在位置と対応しない位置
の画像上の異物候補を異物と判定することを特徴とする
透明容器内の異物検査方法。2. A method for inspecting the mixture of foreign matter in a liquid enclosed in a transparent cylindrical container, wherein illumination light of a predetermined diffusion angle is emitted from a light source at a lateral position of the container. While irradiating the liquid, the camera is placed at a position where a large amount of light is reflected from the foreign matter at a position offset by a certain angle from the direction perpendicular to the center of the luminous flux of the illuminating light. When the liquid inside the container is imaged from the side surface of the container without reflection and a foreign substance candidate is detected by image processing from the image, only the illumination light of a predetermined diffusion angle is emitted from the light source at the side position of the container facing the light source. The liquid in the liquid is irradiated to increase the amount of light received from the bubbles in the liquid, the same field of view of the liquid in the container is captured by the camera, and the bubbles in the liquid are image-processed from the image. Detect and detect air bubbles on the image Particle inspection method of a transparent container, characterized by determining a foreign object candidate on the image of a position that does not correspond to the standing position as foreign.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8163759A JPH09325122A (en) | 1996-06-04 | 1996-06-04 | Method for inspecting foreign matter in transparent container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8163759A JPH09325122A (en) | 1996-06-04 | 1996-06-04 | Method for inspecting foreign matter in transparent container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09325122A true JPH09325122A (en) | 1997-12-16 |
Family
ID=15780169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8163759A Pending JPH09325122A (en) | 1996-06-04 | 1996-06-04 | Method for inspecting foreign matter in transparent container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09325122A (en) |
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